Cross-validation of waist-worn GENEA accelerometer cut-points

Whitney Allegra Welch*, David R. Bassett, Patty S. Freedson, Dinesh John, Jeremy A. Steeves, Scott A. Conger, Tyrone G. Ceaser, Cheryl A. Howe, Jeffer E. Sasaki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


PURPOSE: The purpose of this study was to determine the classification accuracy of the waist gravity estimator of normal everyday activity (GENEA) cut-points developed by Esliger et al. for predicting intensity categories across a range of lifestyle activities. METHODS: Each participant performed one of two routines, consisting of seven lifestyle activities (home/office, ambulatory, and sport). The GENEA was worn on the right waist, and oxygen uptake was continuously measured using the Oxycon mobile. A one-way chi-squared test was used to determine the classification accuracy of the GENEA cut-points. Cross-tabulation tables provided information on under-and overestimations, and sensitivity and specificity analyses of the waist cut-points were also performed. RESULTS: Spearman rank order correlation for the GENEA gravity-subtracted signal vector magnitude and Oxycon mobile MET values was 0.73. For all activities combined, the GENEA accurately predicted intensity classification 55.3% of the time, and it increased to 58.3% when stationary cycling was removed from the analysis. The sensitivity of the cut-points for the four intensity categories ranged from 0.244 to 0.958, and the specificity ranged from 0.576 to 0.943. CONCLUSION: In this cross-validation study, the proposed GENEA cut-points had a low overall accuracy rate for classifying intensity (55.3%) when engaging in 14 different lifestyle activities.

Original languageEnglish (US)
Pages (from-to)1825-1830
Number of pages6
JournalMedicine and science in sports and exercise
Issue number9
StatePublished - Sep 2014


  • Accelerometry
  • Activity Monitor
  • Energy Expenditure
  • Physical Activity

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation


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